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From Discover Magazine | RSS:
Prior to Einstein, physicists believed that light waves, like water waves, were ripples in a medium: instead of the ocean, they posited the existence of the luminiferious aether, some form of substance which supported the propagation of electromagnetic waves. If that idea had been true, one would imagine there would be a unique frame of reference in which the aether was at rest, while it was moving in other frames; consequently, the speed of light would depend on one's motion through the aether.
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